/*
-----------------------------------------------------------------------------
This source file is part of OpenSpace3D
For the latest info, see http://www.openspace3d.com

Copyright (c) 2012 I-maginer

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt

-----------------------------------------------------------------------------
*/

struct ObjStereo = [
  PST_inst                   : PInstance,  
  PST_iMode                  : I,  
  PST_fSpacing               : F,
  PST_bEnable                : I,
  PST_iQuality               : I,
  PST_fRatio                 : F,
  PST_iFrameAcc              : I,
  PST_iNbFrame               : I,
  PST_lostTick               : I
  
  ]mkObjStereo;;

var iRenderQuality_Default = 0;;
var iRenderQuality_Auto = 1;;

fun getStereoMode(mode)=
  if mode == 1 then
    SO3_SM_ANAGLYPH_YB
  else if mode == 2 then
    SO3_SM_INTERLACED_H
  else if mode == 3 then
    SO3_SM_INTERLACED_V
  else if mode == 4 then
    SO3_SM_INTERLACED_CB
  else if mode == 5 then
    SO3_SM_SIDE_BY_SIDE
  else if mode == 6 then
    SO3_SM_UP_DOWN
  else if mode == 7 then
    SO3_SM_QUAD_BUFFER
  else if mode == 8 then
    SO3_SM_OCULUS
  else if mode == 11 then
    SO3_SM_CARDBOARD
  else if mode == 12 then
    SO3_SM_MONO
  else
    SO3_SM_ANAGLYPH_RC;;


fun getStereoModeByName(mode)=
  if !strcmp (strtrim mode) "Anaglyph red/cyan" then
    SO3_SM_ANAGLYPH_RC
  else if !strcmp (strtrim mode) "Anaglyph yellow/blue" then
    SO3_SM_ANAGLYPH_YB
  else if !strcmp (strtrim mode) "Horizontaly interlaced" then
    SO3_SM_INTERLACED_H
  else if !strcmp (strtrim mode) "Verticaly interlaced" then
    SO3_SM_INTERLACED_V
  else if !strcmp (strtrim mode) "Interlaced with checkerboard" then
    SO3_SM_INTERLACED_CB
  else if !strcmp (strtrim mode) "Side by side" then
    SO3_SM_SIDE_BY_SIDE
  else if !strcmp (strtrim mode) "Up/down" then
    SO3_SM_UP_DOWN
  else if !strcmp (strtrim mode) "Quad Buffer" then
    SO3_SM_QUAD_BUFFER
  else if !strcmp (strtrim mode) "Oculus" then
    SO3_SM_OCULUS
  else if !strcmp (strtrim mode) "Cardboard" then
    SO3_SM_CARDBOARD
  else if !strcmp (strtrim mode) "Mono" then
    SO3_SM_MONO
  else
    getStereoMode atoi mode;;


fun deleteOb(inst)=
  let c3dXsession -> sessionstr in
  let V3DgetSessionView sessionstr -> viewstr in
  (
    SO3BufferSetStereoMode sessionstr.V3D_sessionView.V3D_buffer SO3_SM_NONE;
    V3DsetVrMode viewstr 0;
    
    //force viewport size update
    V3DsetViewSizeDirty viewstr;
  );
  0;;


fun cbScenePreRender(inst, sessionstr, etime, obstr)=
  let V3DgetSessionView sessionstr -> viewstr in

  // automatic quality switch
  if (obstr.PST_iNbFrame < 30) then
  (
    set obstr.PST_iFrameAcc = obstr.PST_iFrameAcc + etime;
    set obstr.PST_iNbFrame = obstr.PST_iNbFrame + 1;
  )
  else
  (
    let 1000.0 /. (((itof obstr.PST_iFrameAcc) /. 1000.0) /. 60.0) -> fps in
    (
      if (fps >=. 30.0) then
      (
        set obstr.PST_lostTick = 0;
      )
      else
      (
        if (obstr.PST_lostTick != 0) then nil else
          set obstr.PST_lostTick = _tickcount;
      );
      
      set obstr.PST_iFrameAcc = 0;
      set obstr.PST_iNbFrame = 0;
      
      if ((obstr.PST_lostTick == 0) || ((_tickcount - obstr.PST_lostTick) < 200)) then nil else
      (
        if ((obstr.PST_fRatio <=. 0.75) || (obstr.PST_iQuality != iRenderQuality_Auto)) then nil else
        (
          set obstr.PST_fRatio = obstr.PST_fRatio -. 0.25;
          set obstr.PST_lostTick = 0;
          let (V3DgetDefaultViewport (V3DgetSessionView c3dXsession)) -> viewportstr in
          let SO3ViewportGetPixelPositionSize viewportstr.V3D_viewport -> [_ _ lw lh] in
          let [ftoi ((itof lw) *. obstr.PST_fRatio) ftoi ((itof lh) *. obstr.PST_fRatio)] -> lsize in
          (
            SO3BufferSetStereoMeshTextureSize viewstr.V3D_buffer lsize lsize;
          );
          0;
        );
      );
    );
  );
  0;;


fun cbEnable(inst, from, action, param, rep, obstr) =
  let V3DgetSessionView c3dXsession -> viewstr in
  (
    SO3BufferSetStereoMode viewstr.V3D_buffer obstr.PST_iMode;
    SO3BufferSetStereoEyeSpacing viewstr.V3D_buffer obstr.PST_fSpacing;
    
    setPluginInstanceCbScenePreRender inst mkfun4 @cbScenePreRender obstr;
    set obstr.PST_bEnable = 1;
    
    V3DsetVrMode viewstr (if (obstr.PST_iMode == SO3_SM_MONO) then 0 else 1);
    
    //force viewport size update
    V3DsetViewSizeDirty viewstr;
  );
  0;;


fun cbDisable(inst, from, action, param, rep, obstr) =  
  let V3DgetSessionView c3dXsession -> viewstr in
  (
    SO3BufferSetStereoMode viewstr.V3D_buffer SO3_SM_NONE;    
    setPluginInstanceCbScenePreRender inst nil;    
    set obstr.PST_bEnable = 0;  
    V3DsetVrMode viewstr 0;
    
    //force viewport size update
    V3DsetViewSizeDirty viewstr;
  );
  0;;


fun cbSetMode(inst, from, action, param, rep, obstr) =
  if param == nil then nil else
  let V3DgetSessionView c3dXsession -> viewstr in
  let getStereoModeByName param -> nmode in
  (
    set obstr.PST_iMode = nmode;
    
    if !obstr.PST_bEnable then nil else
    (
      let c3dXsession -> sessionstr in
        SO3BufferSetStereoMode sessionstr.V3D_sessionView.V3D_buffer obstr.PST_iMode;
      
        V3DsetVrMode viewstr (if (obstr.PST_iMode == SO3_SM_MONO) then 0 else 1);        
        
      //force viewport size update
      V3DsetViewSizeDirty viewstr;
    );
  );
  0;;


fun cbSetEyesSpacing(inst, from, action, param, rep, obstr) =
  if (atof param) == nil then nil else
  (
    set obstr.PST_fSpacing = (atof param);
    
    if !obstr.PST_bEnable then nil else
    let c3dXsession -> sessionstr in
      SO3BufferSetStereoEyeSpacing sessionstr.V3D_sessionView.V3D_buffer obstr.PST_fSpacing;
  );
  0;;


fun newOb(inst)=
  let getStereoModeByName (getPluginInstanceParam inst "mode") -> mode in
  let atof (getPluginInstanceParam inst "eyespacing") -> eyespacing in
  let if eyespacing == nil then 0.065 else eyespacing -> eyespacing in
  let atoi (getPluginInstanceParam inst "init") -> init in
  let mkObjStereo [inst mode eyespacing init iRenderQuality_Auto 1.0 0 0 0] -> obstr in
  (  
    if !init then nil else
     cbEnable inst nil nil nil nil obstr;
    
    PluginRegisterAction inst "Enable" mkfun6 @cbEnable obstr;
    PluginRegisterAction inst "Disable" mkfun6 @cbDisable obstr;
    PluginRegisterAction inst "Set mode" mkfun6 @cbSetMode obstr;
    PluginRegisterAction inst "Set eyes spacing" mkfun6 @cbSetEyesSpacing obstr;
  );
  
  setPluginInstanceCbDel inst @deleteOb;
  0;;


fun IniPlug(file)=
  PlugRegister @newOb nil;
  setPluginEditor @dynamicedit;
  0;;